Chemistry - Chemical Kinetics, Catalysis Physical and Chemical Change

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Question - 1

Two reactions with different activation energies have the sane rate at room temperature. Which statement correctly describes the rates of these reaction at the same higher temperatures?

  • A The reaction with the greater activation energy will be faster
  • B The reaction with the smaller activation energy will be faster
  • C The two reaction will have the same rates
  • D A prediction cannot be made without more information

Question - 2

Consider the following statements 

1. First order chemical reaction takes infinite time to complete.

2. Fractional life period of first order chemical reaction does not depend on reactant concentration.

Which one of the following is correct in respect of the above two statements?

  • A Both the statements  are true and Statement II is the correct explanation of Statements  I
  • B Both the statements  are true and Statement II is not the correct explanation of Statements  I
  • C Statements  I is true, but  Statements  II is false
  • D Statements  I is false, but  Statements  II is true

Question - 3

The order of photochemical reaction between H2 and Cl2 is

  • A zero
  • B first
  • C second
  • D third

Question - 4

Match Column I (Different constants) with Column II (Dimensional quantities) and select the correct answer using the codes given below the  Columns.

Column I Column II
A. Boltzmann constant JK-1
B. Molal elevation constant kg K mol-1
C. Zero-order reaction rate constant L mol-1s-1
D. Second-order reaction rate constant mol L-1s-1
  • A A B C D 1 3 4 2
  • B A B C D 4 2 1 3
  • C A B C D 4 3 1 2
  • D A B C D 1 2 4 3

Question - 5

Assertion (A) A chemical reaction becomes faster at higher temperatures.

Reason (R) At higher temperatures molecular motion becomes more rapid.

  • A Both A and B are individually true and R is the correct explanation of A
  • B Both A and B are individually true, but R is not the correct explanation of A
  • C A is true, but R is false
  • D A is false, but R is true

Question - 6

Which among the following has been producing/can produce light by a chemical change?

  • A Sun
  • B Moon
  • C Electric bulb
  • D Lighting and thunder

Question - 7

Match Column I with  Column II

Column I (Process) Column II (Catalyst)
A. Manufacture of sulphuric acid by contact process  1. Fe2O3  + Cr2O3
B. Deacon's process for the manufacture of cholrine 2. Cr2O3
C. Hydrogenation of oil 3. CuCl2
D. Manufacture of hydrogen by Bosch's process  4. V2O5

Select the correct answer using the codes given below the  Columns.

  • A A B C D 1 4 3 2
  • B A B C D 2 1 4 3
  • C A B C D 3 2 1 4
  • D A B C D 4 3 2 1

Question - 8

Pick the wrong statement from the given below.

  • A Carbon dioxide reacts with metallic hydroxides to form their carbonates
  • B Carbon dioxide dissolves in water to form Carbon acid
  • C Carbon dioxide does not react with lime water
  • D Carbon dioxide is a green house gas

Question - 9

Which of the following represents a chemical change?

1. Magnetisation of iron.

2. Condensation of liquid.

3. Burning of fuel.

4. Rusting of iron.

select the correct answer using the codes given below

  • A 1 and 2
  • B 2 and 3
  • C 3 and 4
  • D 1 and 4

Question - 10

In the Haber's process of synthesis of NH3,

  • A Mo acts as a catalyst and Fe as a promotor
  • B Fe acts as a catalyst and Mo as a promotor
  • C Fe acts as inhibitor and Mo as a catalyst
  • D Fe acts as promotor   and Mo as auto catalyst
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